She's one of those who ____ been against the idea from the start.
I want to know the answer. Please tell which one is correct.
HAVE IS THE ANSWER.. IT'S REFERRING TO "THOSE WHO HAVE BEEN"
isn't that the same as "one of the problems that SLOWS progress etc.."? why here it's have and there was slows?!:-/
The verb should agree with the subject in number. Has is the correct one.